/*

 * jpegint.h

 *

 * Copyright (C) 1991-1995, Thomas G. Lane.

 * This file is part of the Independent JPEG Group's software.

 * For conditions of distribution and use, see the accompanying README file.

 *

 * This file provides common declarations for the various JPEG modules.

 * These declarations are considered internal to the JPEG library; most

 * applications using the library shouldn't need to include this file.

 */





/* Declarations for both compression & decompression */



typedef enum {			/* Operating modes for buffer controllers */

	JBUF_PASS_THRU,		/* Plain stripwise operation */

	/* Remaining modes require a full-image buffer to have been created */

	JBUF_SAVE_SOURCE,	/* Run source subobject only, save output */

	JBUF_CRANK_DEST,	/* Run dest subobject only, using saved data */

	JBUF_SAVE_AND_PASS	/* Run both subobjects, save output */

} J_BUF_MODE;



/* Values of global_state field (jdapi.c has some dependencies on ordering!) */

#define CSTATE_START	100	/* after create_compress */

#define CSTATE_SCANNING	101	/* start_compress done, write_scanlines OK */

#define CSTATE_RAW_OK	102	/* start_compress done, write_raw_data OK */

#define CSTATE_WRCOEFS	103	/* jpeg_write_coefficients done */

#define DSTATE_START	200	/* after create_decompress */

#define DSTATE_INHEADER	201	/* reading header markers, no SOS yet */

#define DSTATE_READY	202	/* found SOS, ready for start_decompress */

#define DSTATE_PRELOAD	203	/* reading multiscan file in start_decompress*/

#define DSTATE_PRESCAN	204	/* performing dummy pass for 2-pass quant */

#define DSTATE_SCANNING	205	/* start_decompress done, read_scanlines OK */

#define DSTATE_RAW_OK	206	/* start_decompress done, read_raw_data OK */

#define DSTATE_BUFIMAGE	207	/* expecting jpeg_start_output */

#define DSTATE_BUFPOST	208	/* looking for SOS/EOI in jpeg_finish_output */

#define DSTATE_RDCOEFS	209	/* reading file in jpeg_read_coefficients */

#define DSTATE_STOPPING	210	/* looking for EOI in jpeg_finish_decompress */





/* Declarations for compression modules */



/* Master control module */

struct jpeg_comp_master {

  JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));

  JMETHOD(void, pass_startup, (j_compress_ptr cinfo));

  JMETHOD(void, finish_pass, (j_compress_ptr cinfo));



  /* State variables made visible to other modules */

  boolean call_pass_startup;	/* True if pass_startup must be called */

  boolean is_last_pass;		/* True during last pass */

};



/* Main buffer control (downsampled-data buffer) */

struct jpeg_c_main_controller {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));

  JMETHOD(void, process_data, (j_compress_ptr cinfo,

			       JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,

			       JDIMENSION in_rows_avail));

};



/* Compression preprocessing (downsampling input buffer control) */

struct jpeg_c_prep_controller {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));

  JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,

				   JSAMPARRAY input_buf,

				   JDIMENSION *in_row_ctr,

				   JDIMENSION in_rows_avail,

				   JSAMPIMAGE output_buf,

				   JDIMENSION *out_row_group_ctr,

				   JDIMENSION out_row_groups_avail));

};



/* Coefficient buffer control */

struct jpeg_c_coef_controller {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));

  JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,

				   JSAMPIMAGE input_buf));

};



/* Colorspace conversion */

struct jpeg_color_converter {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo));

  JMETHOD(void, color_convert, (j_compress_ptr cinfo,

				JSAMPARRAY input_buf, JSAMPIMAGE output_buf,

				JDIMENSION output_row, int num_rows));

};



/* Downsampling */

struct jpeg_downsampler {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo));

  JMETHOD(void, downsample, (j_compress_ptr cinfo,

			     JSAMPIMAGE input_buf, JDIMENSION in_row_index,

			     JSAMPIMAGE output_buf,

			     JDIMENSION out_row_group_index));



  boolean need_context_rows;	/* TRUE if need rows above & below */

};



/* Forward DCT (also controls coefficient quantization) */

struct jpeg_forward_dct {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo));

  /* perhaps this should be an array??? */

  JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,

			      jpeg_component_info * compptr,

			      JSAMPARRAY sample_data, JBLOCKROW coef_blocks,

			      JDIMENSION start_row, JDIMENSION start_col,

			      JDIMENSION num_blocks));

};



/* Entropy encoding */

struct jpeg_entropy_encoder {

  JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));

  JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));

  JMETHOD(void, finish_pass, (j_compress_ptr cinfo));

};



/* Marker writing */

struct jpeg_marker_writer {

  /* write_any_marker is exported for use by applications */

  /* Probably only COM and APPn markers should be written */

  JMETHOD(void, write_any_marker, (j_compress_ptr cinfo, int marker,

				   const JOCTET *dataptr, unsigned int datalen));

  JMETHOD(void, write_file_header, (j_compress_ptr cinfo));

  JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));

  JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));

  JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));

  JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));

};





/* Declarations for decompression modules */



/* Master control module */

struct jpeg_decomp_master {

  JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));



  /* State variables made visible to other modules */

  boolean is_dummy_pass;	/* True during 1st pass for 2-pass quant */

};



/* Input control module */

struct jpeg_input_controller {

  JMETHOD(int, consume_input, (j_decompress_ptr cinfo));

  JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));

  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));



  /* State variables made visible to other modules */

  boolean has_multiple_scans;	/* True if file has multiple scans */

  boolean eoi_reached;		/* True when EOI has been consumed */

};



/* Main buffer control (downsampled-data buffer) */

struct jpeg_d_main_controller {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));

  JMETHOD(void, process_data, (j_decompress_ptr cinfo,

			       JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,

			       JDIMENSION out_rows_avail));

};



/* Coefficient buffer control */

struct jpeg_d_coef_controller {

  JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));

  JMETHOD(int, consume_data, (j_decompress_ptr cinfo));

  JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));

  JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,

				 JSAMPIMAGE output_buf));

  /* Pointer to array of coefficient virtual arrays, or NULL if none */

  jvirt_barray_ptr *coef_arrays;

};



/* Decompression postprocessing (color quantization buffer control) */

struct jpeg_d_post_controller {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));

  JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,

				    JSAMPIMAGE input_buf,

				    JDIMENSION *in_row_group_ctr,

				    JDIMENSION in_row_groups_avail,

				    JSAMPARRAY output_buf,

				    JDIMENSION *out_row_ctr,

				    JDIMENSION out_rows_avail));

};



/* Marker reading & parsing */

struct jpeg_marker_reader {

  JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));

  /* Read markers until SOS or EOI.

   * Returns same codes as are defined for jpeg_consume_input:

   * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.

   */

  JMETHOD(int, read_markers, (j_decompress_ptr cinfo));

  /* Read a restart marker --- exported for use by entropy decoder only */

  jpeg_marker_parser_method read_restart_marker;

  /* Application-overridable marker processing methods */

  jpeg_marker_parser_method process_COM;

  jpeg_marker_parser_method process_APPn[16];



  /* State of marker reader --- nominally internal, but applications

   * supplying COM or APPn handlers might like to know the state.

   */

  boolean saw_SOI;		/* found SOI? */

  boolean saw_SOF;		/* found SOF? */

  int next_restart_num;		/* next restart number expected (0-7) */

  unsigned int discarded_bytes;	/* # of bytes skipped looking for a marker */

};



/* Entropy decoding */

struct jpeg_entropy_decoder {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,

				JBLOCKROW *MCU_data));

};



/* Inverse DCT (also performs dequantization) */

typedef JMETHOD(void, inverse_DCT_method_ptr,

		(j_decompress_ptr cinfo, jpeg_component_info * compptr,

		 JCOEFPTR coef_block,

		 JSAMPARRAY output_buf, JDIMENSION output_col));



struct jpeg_inverse_dct {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  /* It is useful to allow each component to have a separate IDCT method. */

  inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];

};



/* Upsampling (note that upsampler must also call color converter) */

struct jpeg_upsampler {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, upsample, (j_decompress_ptr cinfo,

			   JSAMPIMAGE input_buf,

			   JDIMENSION *in_row_group_ctr,

			   JDIMENSION in_row_groups_avail,

			   JSAMPARRAY output_buf,

			   JDIMENSION *out_row_ctr,

			   JDIMENSION out_rows_avail));



  boolean need_context_rows;	/* TRUE if need rows above & below */

};



/* Colorspace conversion */

struct jpeg_color_deconverter {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, color_convert, (j_decompress_ptr cinfo,

				JSAMPIMAGE input_buf, JDIMENSION input_row,

				JSAMPARRAY output_buf, int num_rows));

};



/* Color quantization or color precision reduction */

struct jpeg_color_quantizer {

  JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));

  JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,

				 JSAMPARRAY input_buf, JSAMPARRAY output_buf,

				 int num_rows));

  JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));

  JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));

};





/* Miscellaneous useful macros */



#undef MAX

#define MAX(a,b)	((a) > (b) ? (a) : (b))

#undef MIN

#define MIN(a,b)	((a) < (b) ? (a) : (b))





/* We assume that right shift corresponds to signed division by 2 with

 * rounding towards minus infinity.  This is correct for typical "arithmetic

 * shift" instructions that shift in copies of the sign bit.  But some

 * C compilers implement >> with an unsigned shift.  For these machines you

 * must define RIGHT_SHIFT_IS_UNSIGNED.

 * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.

 * It is only applied with constant shift counts.  SHIFT_TEMPS must be

 * included in the variables of any routine using RIGHT_SHIFT.

 */



#ifdef RIGHT_SHIFT_IS_UNSIGNED

#define SHIFT_TEMPS	INT32 shift_temp;

#define RIGHT_SHIFT(x,shft)  \

	((shift_temp = (x)) < 0 ? \

	 (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \

	 (shift_temp >> (shft)))

#else

#define SHIFT_TEMPS

#define RIGHT_SHIFT(x,shft)	((x) >> (shft))

#endif





/* Short forms of external names for systems with brain-damaged linkers. */



#ifdef NEED_SHORT_EXTERNAL_NAMES

#define jinit_compress_master	jICompress

#define jinit_c_master_control	jICMaster

#define jinit_c_main_controller	jICMainC

#define jinit_c_prep_controller	jICPrepC

#define jinit_c_coef_controller	jICCoefC

#define jinit_color_converter	jICColor

#define jinit_downsampler	jIDownsampler

#define jinit_forward_dct	jIFDCT

#define jinit_huff_encoder	jIHEncoder

#define jinit_phuff_encoder	jIPHEncoder

#define jinit_marker_writer	jIMWriter

#define jinit_master_decompress	jIDMaster

#define jinit_d_main_controller	jIDMainC

#define jinit_d_coef_controller	jIDCoefC

#define jinit_d_post_controller	jIDPostC

#define jinit_input_controller	jIInCtlr

#define jinit_marker_reader	jIMReader

#define jinit_huff_decoder	jIHDecoder

#define jinit_phuff_decoder	jIPHDecoder

#define jinit_inverse_dct	jIIDCT

#define jinit_upsampler		jIUpsampler

#define jinit_color_deconverter	jIDColor

#define jinit_1pass_quantizer	jI1Quant

#define jinit_2pass_quantizer	jI2Quant

#define jinit_merged_upsampler	jIMUpsampler

#define jinit_memory_mgr	jIMemMgr

#define jdiv_round_up		jDivRound

#define jround_up		jRound

#define jcopy_sample_rows	jCopySamples

#define jcopy_block_row		jCopyBlocks

#define jzero_far		jZeroFar

#define jpeg_zigzag_order	jZIGTable

#define jpeg_natural_order	jZAGTable

#endif /* NEED_SHORT_EXTERNAL_NAMES */





/* Compression module initialization routines */

EXTERN void jinit_compress_master JPP((j_compress_ptr cinfo));

EXTERN void jinit_c_master_control JPP((j_compress_ptr cinfo,

					boolean transcode_only));

EXTERN void jinit_c_main_controller JPP((j_compress_ptr cinfo,

					 boolean need_full_buffer));

EXTERN void jinit_c_prep_controller JPP((j_compress_ptr cinfo,

					 boolean need_full_buffer));

EXTERN void jinit_c_coef_controller JPP((j_compress_ptr cinfo,

					 boolean need_full_buffer));

EXTERN void jinit_color_converter JPP((j_compress_ptr cinfo));

EXTERN void jinit_downsampler JPP((j_compress_ptr cinfo));

EXTERN void jinit_forward_dct JPP((j_compress_ptr cinfo));

EXTERN void jinit_huff_encoder JPP((j_compress_ptr cinfo));

EXTERN void jinit_phuff_encoder JPP((j_compress_ptr cinfo));

EXTERN void jinit_marker_writer JPP((j_compress_ptr cinfo));

/* Decompression module initialization routines */

EXTERN void jinit_master_decompress JPP((j_decompress_ptr cinfo));

EXTERN void jinit_d_main_controller JPP((j_decompress_ptr cinfo,

					 boolean need_full_buffer));

EXTERN void jinit_d_coef_controller JPP((j_decompress_ptr cinfo,

					 boolean need_full_buffer));

EXTERN void jinit_d_post_controller JPP((j_decompress_ptr cinfo,

					 boolean need_full_buffer));

EXTERN void jinit_input_controller JPP((j_decompress_ptr cinfo));

EXTERN void jinit_marker_reader JPP((j_decompress_ptr cinfo));

EXTERN void jinit_huff_decoder JPP((j_decompress_ptr cinfo));

EXTERN void jinit_phuff_decoder JPP((j_decompress_ptr cinfo));

EXTERN void jinit_inverse_dct JPP((j_decompress_ptr cinfo));

EXTERN void jinit_upsampler JPP((j_decompress_ptr cinfo));

EXTERN void jinit_color_deconverter JPP((j_decompress_ptr cinfo));

EXTERN void jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));

EXTERN void jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));

EXTERN void jinit_merged_upsampler JPP((j_decompress_ptr cinfo));

/* Memory manager initialization */

EXTERN void jinit_memory_mgr JPP((j_common_ptr cinfo));



/* Utility routines in jutils.c */

EXTERN long jdiv_round_up JPP((long a, long b));

EXTERN long jround_up JPP((long a, long b));

EXTERN void jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,

				   JSAMPARRAY output_array, int dest_row,

				   int num_rows, JDIMENSION num_cols));

EXTERN void jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,

				 JDIMENSION num_blocks));

EXTERN void jzero_far JPP((void FAR * target, size_t bytestozero));

/* Constant tables in jutils.c */

extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */

extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */



/* Suppress undefined-structure complaints if necessary. */



#ifdef INCOMPLETE_TYPES_BROKEN

#ifndef AM_MEMORY_MANAGER	/* only jmemmgr.c defines these */

struct jvirt_sarray_control { long dummy; };

struct jvirt_barray_control { long dummy; };

#endif

#endif /* INCOMPLETE_TYPES_BROKEN */

